And when the mirthless Fred Hafetz, Mr. Marshall???s lawyer, challenges them on cross-examination, even if he???s just doing his job, he almost seems like a party pooper.And speaking of parties, vying with Mr. Auchincloss for most charming witness may have been John Hart, the producer of such films as Proof, Revolutionary Road, and Nicholas Nickleby, and of the plays Guys and Dolls and The Produce